Did you click / tap in the suggest ID box (web / mobile app) and then wait? Suggestions usually pop-up.
See these iNat Video Tutorials for examples [1]
See these iNat Video Tutorials for examples [1]
Didn't even know the one in the video existed until now.
I found an iNat page on uploading observations from Flickr [1] which is probably what you used. It seems to say you can add an ID for each upload but it doesn't say if the AI will help you with the ID, like with the direct uploading to iNat.